Johnson's natural philosophy and key to philosophical charts : illustrated with 500 cuts; being reduced photographic copies of all the diagrams contained in the author's philosophical series of indestructible school charts ; for the use of schools and families (1878)
)ump X. Operatiojst.—As the piston is drawn up to L, the upper valve (sit-uated in the centre of the piston) closes by its own weight and down-ward pressure of the air, and the downward pressure on the lowervalve, T, being thus removed, the air in the receiver will, by expansion. Fig. 27. … open and pass through it; as shown by the arrow passing into thepipe and through the valve. Now, if the piston be pushed down, thelower valve will close, and the dilated air in the pump will be com-pressed and pass through the upper valve. By again raising the piston,the air in the receiver will be…
Physics · Astronomy
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